NRSG 112 ch 2 notes.docx - CHAPTER 2 HUMAN REPRODUCTIVE ANATOMY AND PHYSIOLOGY Boys grow taller more muscular and develop pubic and facial hair and a

NRSG 112 ch 2 notes.docx - CHAPTER 2 HUMAN REPRODUCTIVE...

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CHAPTER 2 HUMAN REPRODUCTIVE ANATOMY AND PHYSIOLOGY Boys grow taller, more muscular, and develop pubic and facial hair and a deepened voice. Girls experience menarche, broadened hips, breasts, and pubic and axillary hair. Rapid change in boys and girls during which the reproductive system matures and becomes capable of reproduction Begins when the secondary sex characteristics (e.g. pubic hair) appear Ends when mature sperm are formed or when regular menstrual cycles occur **transition from childhood to adulthood, some cultures celebrate The hormone levels in the male are constant, not cyclic as in females. Male - Hormonal changes normally begin between 10 and 16 years Outward changes become apparent when the size of penis and testes increases and there is a general growth spurt Testosterone (primary male sex hormone) causes the boy to grow taller, more muscular and develop secondary sex characteristics: 1. Pubic hair 2. Facial hair 3. Deeper voice-often squeaks or cracks before reaching its final pitch Testosterone levels are constant, not cyclical as female hormones Nocturnal emissions “wet dreams” may occur without sexual stimulation (usually do not contain sperm) What is the first outward change of puberty in males? 1) Development of pubic hair 2) Nocturnal emissions 3) Voice deepens 4) Penis and testes increase in size Male (internal) Testes, Vas Deferens, prostate, seminal vesicles, ejaculatory ducts, urethra, and accessory glands Testes -Manufacture male germ cells (spermatozoa or sperm) and secrete male hormones (androgens) Testosterone (most abundant male sex hormone begins with the anterior pituitary gland, The hypothalamus directs the anterior pituitary gland to secret follicle-stimulating hormone (FSH) and luteinizing hormone (LH). These hormones initiate the production of testosterone in the Leydig cells of the testes.
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